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Speckle Interferometry of Metal-Poor Stars in the Solar Neighborhood.II

The results of speckle interferometric observations of 115 metal-poor stars [m/H]<-1 within 250 pc from the Sun and with proper motions mu <= 0.2"/yr, made with the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences, are reported. Close companions with separations ranging from 0.034" to 1" were observed for 12 objects - G76-21, G59-1, G63-46, G135-16, G168-42, G141-47, G142-44, G190-10, G28-43, G217-8, G130-7, and G89-14 - eight of them are astrometrically resolved for the first time. The newly resolved systems include one triple star - G190-10. If combined with spectroscopic and visual data, our results imply a single:binary:triple:quadruple star ratio of 147:64:9:1 for a sample of 221 primary components of halo and thick-disk stars.

preprint2008arXivOpen access
D. A. RastegaevYu. Yu. BalegaA. F. MaksimovE. V. MalogolovetsV. V. Dyachenko
astro-ph
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D. A. RastegaevYu. Yu. BalegaA. F. MaksimovE. V. MalogolovetsV. V. Dyachenko

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